JP2022524439A - Orthopedic system with medial pivot femoral components and inserts - Google Patents

Abstract

The orthopedic system includes a tibial insert and a femoral component configured to articulate on the tibial insert. The tibial insert includes the joint surface and the femoral component includes the femoral joint surface with a radius of curvature that decreases posteriorly. The articular surface of the tibial insert contains an increased anterior lip to improve the stability of the femoral component.

Description

(Mutual reference of related applications)
This patent application claims the priority and interests of US Provisional Patent Application No. 62 / 817,173, entitled "ORTHOPADEIC SYSTEM WITH MEDIA PIVOTING FEMORAL COMPONENT AND INSERT", filed March 12, 2019. Yes, the whole of which is expressly incorporated into this application by reference.

(Field of invention)
The present invention relates to an orthopedic system, and more specifically to an orthopedic system for performing knee arthroplasty.

Arthroplasty is a well-known surgical procedure that replaces a lesioned and / or damaged living joint with an artificial joint. A typical knee prosthesis includes a tibial tray, a femoral component, and a polymer insert or bearing positioned between the tibial tray and the femoral component. Various mobile orthopedic prostheses can be used, depending on the severity of the damage to the patient's joints. For example, the knee prosthesis may include a "fixed" tibial insert when it is desirable to limit the movement of the knee prosthesis, such as in the presence of significant soft tissue damage or loss. Alternatively, the knee prosthesis may include a "movable" tibial insert if greater freedom of movement is desired. In addition, the knee prosthesis is an artificial knee prosthesis designed to replace the femoral tibial interface of both condyles of the patient's femur, or the femoral-tibial interface of a single condyle of the patient's femur. It can be a unicompartment knee prosthesis designed to replace.

The type of orthopedic knee prosthesis used to replace the patient's natural knee joint is also whether the patient's posterior cruciate ligament is retained or sacrificed (ie, removed) during surgery. It can depend on you somehow. For example, if the patient's posterior cruciate ligament is injured, lesioned, and / or otherwise removed during surgery, a posterior stabilized knee prosthesis is used to provide additional support and / or control in posterior flexion. can do. Alternatively, if the posterior cruciate ligament is intact, a cruciate ligament-retaining knee prosthesis may be used.

Typical orthopedic knee prostheses are generally designed to reproduce the natural movement of the patient's joints. When the knee is flexed and extended, the femoral and tibial components undergo range of motion, a combination of relative anterior-posterior movement and relative internal-external rotation. However, the soft tissue surrounding the patient also affects the kinematics and stability of the orthopedic knee prosthesis over the range of motion of the joint. That is, the force exerted on the orthopedic component by the patient's soft tissue can cause unwanted or unwanted movement of the orthopedic knee prosthesis. For example, an orthopedic knee prosthesis may exhibit an unnatural (odd) anterior joint translational movement as the femoral component is moved through the range of flexion.

The present disclosure provides stability with a tibial insert configured to allow asymmetric pivoting of the femoral component bearing on the tibial insert, and a raised anterior medial surface that fits the femoral component. To provide an orthopedic system, which has a geometric shape for use.

According to one aspect of the present disclosure, an orthopedic system may include a tibial insert and a femoral component. The tibial insert may include medial and lateral joint surfaces. The medial and lateral joint surfaces can be shaped asymmetrically with respect to each other. The femoral component may include a medial condyle configured to form a joint on the medial joint surface of the tibial insert and a lateral condyle configured to form a joint on the lateral joint surface of the tibial insert. The medial condyle of the femoral component has a first radius of curvature extending posteriorly to a first tortuosity of 70 degrees or less, and a second tortuosity greater than the first tortuosity. Includes a femoral joint surface, with a plurality of decreasing radius of curvature extending posteriorly.

In some embodiments, the femoral joint surface of the femoral component has a second radius of curvature at the second tortuosity. In such an embodiment, the second radius of curvature may be greater than the rearmost radius of the plurality of decreasing radii of curvature. Additionally or additionally, the femoral joint surface of the femoral component may have a second radius of curvature behind the decreasing radius of curvature that is greater than the posterior radius of the plurality of decreasing radii of curvature.

In addition, in some embodiments, the medial joint surface of the tibial insert and the femoral joint surface of the medial condyle of the femoral component are greater than the lateral joint surface of the tibial insert and the femoral joint surface of the lateral condyle of the femoral component. There is compatibility. For example, the medial joint surface and the femoral joint surface of the medial condyle can have at least 96% anterior-posterior compatibility with zero degree flexion. Additional or alternative, the medial joint surface of the tibial insert and the femoral joint surface of the medial condyle may have at least 93% medial-lateral compatibility. Additional or alternative, the lateral joint surface of the tibial insert and the femoral joint surface of the lateral condyle may have at least 93% medial-lateral compatibility.

In some embodiments, the tibial insert comprises an anterior medial lip with a first height and an anterior lateral lip with a second height. In such an embodiment, the first height of the anterior medial lip is greater than the second height of the anterior lateral lip. In addition, the medial joint surface of the tibial insert may include a dwell point and the first height of the anterior medial lip relative to the dwell point may be at least 9 mm. Additional or alternative, the medial joint surface of the tibial insert may include dwell points that have an arched or oval shape when viewed in cross section.

In some embodiments, the medial joint surface of the tibial insert comprises a dwell point and anterior medial lip. In such an embodiment, the anterior medial lip has a height relative to a dwell point of at least 9 millimeters. In addition, in some embodiments, the medial joint surface of the tibial insert may include dwell points that have an arched or oval shape when viewed in cross section. Further, in some embodiments, the first radius of curvature has a length of 41% to 47% of the anterior-posterior length of the tibial insert. In some embodiments, the medial joint surface of the tibial insert comprises a dwell point, and the lateral joint surface provides an arched pathway for pivoting the femoral component around the dwell point. In addition, in some embodiments, the first radius of curvature may extend forward to a degree of hyperextension tortuosity of 30 degrees or less.

According to another aspect, the tibial insert of the knee replacement system comprises the lateral and medial joint surfaces. The lateral joint surface may be configured to articulate with the lateral condyle of the femoral component. Similarly, the medial joint surface may be configured to articulate with the medial condyle of the femoral component. In addition, the medial joint surface is shaped asymmetrically with respect to the lateral joint surface and includes a dwell point and an anterior medial lip having a height of at least 9 millimeters relative to the dwell point.

In some embodiments, the medial joint surface and the medial condyle of the femoral component are more compatible than the lateral joint surface and the lateral condyle of the femoral component. In addition, in some embodiments, the dwell points have an arched or oval shape when viewed in cross section. Further, in some embodiments, the lateral joint surface may include an anterior lateral lip having a height lower than the height of the anterior medial lip.

According to yet another aspect, the orthopedic system may include a tibial insert and a femoral component. Tibial inserts may include lateral and medial joint surfaces. The femoral component may include a medial condyle configured to form a joint on the medial joint surface of the tibial insert and a lateral condyle configured to form a joint on the lateral joint surface of the tibial insert. The medial condyle of the femoral component has a first radius of curvature extending posteriorly to a first tortuosity of 70 degrees or less, and a second tortuosity greater than the first tortuosity. It may include a femoral joint surface, with a plurality of decreasing radius of curvature extending posteriorly. In addition, the medial joint surface of the tibial insert is asymmetrically shaped with respect to the lateral joint surface, having a dwell point with an arched or oval shape and a height of at least 9 mm with respect to the dwell point. Includes anterior medial lip and.

In some embodiments, the tibial insert may include an anterior lateral lip, in which the height of the anterior medial lip is greater than the height of the anterior lateral lip. In addition, in some embodiments, the femoral joint surface of the femoral component has a second radius of curvature at the second tortuosity. The second radius of curvature may be greater than the rearmost radius of the plurality of decreasing radii of curvature. In some embodiments, the second radius of curvature can be behind the decreasing radius of curvature.

In addition, in some embodiments, the medial joint surface of the tibial insert and the femoral joint surface of the medial condyle of the femoral component are greater than the lateral joint surface of the tibial insert and the femoral joint surface of the lateral condyle of the femoral component. There can be compatibility. For example, the medial joint surface of the tibial insert and the femoral joint surface of the medial condyle may have at least 93% medial-lateral compatibility. In some embodiments, the lateral joint surface may provide an arched pathway for pivoting the femoral component around the dwell point. In addition, in some embodiments, the first radius of curvature may extend forward to a degree of hyperextension tortuosity of 30 degrees or less.

According to yet another aspect, the orthopedic system includes a tibial insert and a femoral component. The tibial insert may have a joint surface and the femoral component may have a condyle configured to form a joint on the joint surface of the tibial insert. The condyle of the femoral component has a first radius of curvature extending posteriorly to a first tortuosity of 70 degrees or less and posterior from a first tortuosity to a second tortuosity greater than the first tortuosity. May include a femoral joint surface, with a plurality of diminishing radius of curvature extending into. The articular surface of the tibial insert may include a dwell point having an arched or oval shape when viewed in cross section, and an anterior lip having a height of at least 9 millimeters relative to the dwell point.

In some embodiments, the femoral joint surface of the femoral component has a second radius of curvature at the second tortuosity. In such an embodiment, the second radius of curvature may be greater than the rearmost radius of the plurality of decreasing radii of curvature. In addition, in some embodiments, the second radius of curvature can be behind the decreasing radius of curvature. Moreover, in some embodiments, the joint surface of the tibial insert and the femoral joint surface of the condyle may have at least 93% medial-lateral compatibility.

For a detailed description, specifically, the following drawings will be referred to.
FIG. 3 is a front perspective view of a tibial insert with an asymmetric joint surface. FIG. 3 is a front perspective view of a known tibial insert with a symmetrical joint surface. FIG. 2 is a top view of a known tibial insert of FIG. It is a top view of the orthopedic insert of FIG. 1 is a side perspective view of an orthopedic system including the femoral component and tibial insert of FIGS. 1 and 3B. 1 is a top view of the tibial insert of FIGS. 1 and 3B. 1 is a rear view of the tibial insert of FIGS. 1 and 3B. 1 is an internal side view of the tibial insert of FIGS. 1 and 3B. The outside of the orthopedic insert of FIGS. 1 and 3B. 1 is a front view of the tibial insert of FIGS. 1 and 3B.

Although the concepts of the present disclosure are prone to various modifications and alternatives, specific exemplary embodiments are illustrated in the drawings and are described in detail herein. However, it is not intended to limit the concept of the present disclosure to any particular form disclosed, and conversely, the invention is intended and scoped as defined by the appended claims. It should be understood that it is intended to cover all modifications, equivalents, and alternatives contained in.

Terms such as anterior, posterior, medial, lateral, superior, and inferior, which represent anatomical criteria, are used throughout this specification with respect to orthopedic implants and orthopedic surgical instruments described herein, as well as patients. Can be used with respect to the vivisection structure of. Such terms have well-understood meanings in both the fields of anatomy and orthopedics. The use of such anatomical reference terms in the written description and "Claims" is intended to have their well-understood meaning and consistency, unless otherwise stated.

Here, with reference to the drawings, with reference to FIG. 1 in more detail, exemplary embodiments of the tibial insert 100 provided in accordance with the present disclosure are shown. For comparison, a known tibial insert 200 is shown in FIG. Each tibial insert 100, 200 has an anterior-posterior centerline CL1, CL2, a medial joint surface 102, 104 on one half of each of the centerlines CL1, CL2, and the other of the centerlines CL1, CL2, respectively. The lateral joint surfaces 104, 114, which are half above the surface of the joint, are defined. Unlike the known tibial insert 200, the articular surfaces 102, 112 of the tibial insert 100 are asymmetrically shaped to provide asymmetric pivoting of the femoral component bearing on the tibial insert 100. The medial joint surface 102 of the tibial insert 100 is more compatible with the condyle portion of the femoral component than, for example, the medial joint surface 104 of the tibial insert 200, as further described herein. The tibial insert 100 also has a relatively raised anterior surface (anterior medial lip height 122) on the medial side of the tibial insert 100 as compared to the tibial insert 200 (anterior medial lip height 144).

Referring here to FIG. 3B, with reference to FIG. 1, the lateral 310 of the tibial insert 100 pivots the femoral component around a medial pivot point 314 extending through the medial joint surface 102. To provide an arched path 312 indicated by a curved arrow. The arched path 312 may be laterally centered on the medial pivot point 314. This pivotal movement differs from the movement paths 302, 304 of the femoral component bearing on the tibial insert 200, which is symmetrical as shown in FIG. 3A. Thus, unlike the tibial insert 200, the tibial insert 100 provides a medial pivot point for the femoral component bearing on the tibial insert 100.

Referring now to FIG. 4, an orthopedic system 400 including a femoral component 410 bearing on the tibial insert 100 shown in FIGS. 1 and 3B is shown. The femoral component 410 includes a medial femoral condyle 412 configured to articulate on the medial joint surface 102 of the tibial insert 100 and a lateral femoral condyle 414 configured to articulate on the lateral joint surface 112. including. One or both of the femoral condyles 412 and 414 may define an anteriorly extending radius of curvature at 10-30 degrees. One or both of the femoral condyles 412 and 414 may define a radius of curvature 418 that extends anteriorly with an extension of 30 degrees or less. In addition, as shown in FIG. 4, the femoral component 410 is 30-70 degrees before gradually reducing the radius of curvature defining the rest of the sagittal shape of the femoral component 410 following the tortuosity 422. A constant radius of curvature 420 that extends posteriorly up to the degree of tortuosity 422 can be defined. The femoral component 410 has a constant radius of curvature that can extend posteriorly to a tortuosity 422 of 70 degrees or less before gradually reducing the radius of curvature defining the rest of the sagittal shape of the femur component. Can be defined.

For inner conforming designs with a series of radii of curvature, the choice of conforming is important in defining the ability to resist bizarre translational motion. Some embodiments of the femoral component 410 have a constant radius of curvature 420 extending to a degree of tortuosity of 30 degrees or less, after which the radius of curvature may be continuously reduced over a range of tortuosities. .. Some embodiments can extend to a degree of flexion of 70 degrees or less, and then include a small radius of curvature of a much smaller size to define the posterior condyle sagittal shape during deep flexion. Obtain, may have a radius of curvature 420. For natural medial pivotal movements, some embodiments may have a higher range of suitability on the medial side for stability, adding a series of smaller radii of curvature at deeper flexion angles. Normal walking can be restored. The articular surface of the lateral femoral condyle 414 is generally less sagittal than the articular surface of the medial femoral condyle 412. The lateral tibial surface has an arcuate shape approximately centered around the lowest position or dwell point / region of the medial compatible surface. As such, the dwell point functions as the medial pivot point of the femoral component bearing on the tibial insert 100.

The relationship between the anterior-posterior (AP) length 430 of the tibial insert 100 and the size of the radius of curvature 418 of the femoral component 410 is important. If the radius of curvature 418 and / or the radius of curvature 420 is too large (depending on the particular tortuosity), a booking or hinge effect can occur in the intermediate bend. If the radius of curvature 420 is too small, the set of radii of curvature may need to be increased at some point to obtain the required anterior-posterior dimensions of the implant. In some embodiments, the radius of curvature 420 may be 41% to 47% of the anterior-posterior length of the tibial insert 100. The ratio of coronary curvature to sagittal curvature to the radius of curvature defining the cross section of the femoral component 410 may be, for example, 41% to 100%.

Here, with reference to FIGS. 5A-5E, the geometry of the tibial insert 100 is shown. As mentioned above, the medial joint surface 102 of the tibial insert 100 fits into the femoral component 410. The anterior-posterior surface compatibility of the medial joint surface 102 may be at least 96% of the radius of curvature 420 of the femoral component 410 (eg, with zero degree flexion). For example, the anterior-posterior compatibility between the medial joint surface 102 of the femoral component 410 and the corresponding femoral joint surface may be 96% or greater (eg, with zero degree flexion). The medial-lateral compatibility of the medial joint surface 102 and the lateral joint surface 112 may be at least 93% of the medial-lateral condyle radius of curvature of the femoral component 410. For example, the medial-lateral compatibility between the medial joint surface 102 and the lateral joint surface 112, as well as the corresponding femoral joint surface of the femoral component 410, may be 93% or greater.

For optimum medial stability, it is necessary to extend the extension radius forward by 20-30 degrees. The natural knee joint does not hyperextend to these degrees, but the alignment fit on the tibial surface forms a higher medial anterior surface than the highest design. The minimum height of the anterior medial lip 502 (see FIG. 5E) may have a height 504 that is at least 9 mm higher than the lowest dwell point 506 (see FIG. 5A) on the medial joint surface 102. This higher surface can increase the overall suitability of the medial joint surface 102 and reduce the possibility of dislocation if the surface height is 9 mm or more higher than the lowest joint surface area or dwell point 506. can. The inner dwell point 506 may be a curved dwell point having the shape of an arc, or may be an ellipse with a flat surface of 1 mm or less between the two curved surfaces.

Another feature of the tibial insert 100 is the location of the dwell point 506 on the medial joint surface 102. If the medial dwell point 506 points too anteriorly, the knee prosthesis may not be able to achieve a deeper flexion angle without removing posterior compatibility on the tibial surface. If the dwell point 506 on the medial joint surface 102 is oriented too posteriorly, the anterior surface of the medial joint surface 102 will have difficulty obtaining the required extension of the knee prosthesis and excessive posterior loading through the tibia. , Can induce some loosening of the tibial insert 100 from the cement. The dwell positions of both the medial joint surface 102 and the lateral joint surface 112 may be aligned with the respective condyles of the femoral component 410.

With respect to the ratio of suitability of the medial and lateral condyle surfaces of the femoral component 410, this ratio is important in defining pivotal movement. If the coronary radius is excessively flat, the implant or orthopedic system will rotate and the ability to maintain anterior stability will be impaired.

Although the present invention has been described with respect to at least one embodiment, the present invention may be further modified within the spirit and scope of the present disclosure. Accordingly, this application shall include any modification, use, or adaptation of the invention that uses its general principles. Further, the present application shall include such deviations from the present disclosure as being known or practiced in the art in which the invention relates.

[Implementation mode]
(1) An orthopedic system
A tibial insert having a medial and lateral joint surfaces, wherein the medial and lateral joint surfaces are formed asymmetrically with respect to each other.
A femoral component having a medial condyle configured to form a joint on the medial joint surface of the tibial insert and a lateral condyle configured to form a joint on the lateral joint surface of the tibial insert. There is a first radius of curvature in which the medial condyle of the femoral component extends posteriorly to a first degree of flexion of 70 degrees or less, and from the first degree of flexion to the first degree of flexion. A system for orthopedic surgery, including a femoral component, including a femoral joint surface, with a plurality of diminishing radius of curvature extending posteriorly to a large second degree of flexion.
(2) The femoral joint surface of the femoral component has a second radius of curvature at the second tortuosity, the second radius of curvature being greater than each of the decreasing radius of curvature. The orthopedic system according to embodiment 1.
(3) In Embodiment 1, the femoral joint surface of the femoral component has a second radius of curvature behind the diminishing radius of curvature, which is greater than the rearmost radius of the plurality of diminishing radii of curvature. The described orthopedic system.
(4) The medial joint surface of the tibial insert and the femoral joint surface of the medial condyle of the femoral component are the lateral joint surface of the tibial insert and the femoral joint surface of the lateral condyle of the femoral component. The orthopedic system according to embodiment 1, which is more compatible than the above.
(5) The orthopedic use according to embodiment 4, wherein the medial joint surface of the tibial insert and the femoral joint surface of the medial condyle have at least 96% anterior-posterior compatibility with zero degree flexion. system.

(6) The orthopedic system according to embodiment 4, wherein the medial joint surface of the tibial insert and the femoral joint surface of the medial condyle have at least 93% medial-lateral compatibility.
(7) The orthopedic system according to embodiment 6, wherein the lateral joint surface of the tibial insert and the femoral joint surface of the lateral condyle have at least 93% medial-lateral compatibility.
(8) The tibial insert comprises an anterior medial lip having a first height and an anterior lateral lip having a second height, wherein the first height of the anterior medial lip is the anterior. The orthopedic system according to embodiment 1, which is larger than the second height of the outer lip.
(9) The orthopedic use according to embodiment 8, wherein the medial joint surface of the tibial insert comprises a dwell point and the first height of the anterior medial lip relative to the dwell point is at least 9 millimeters. system.
(10) The orthopedic system according to embodiment 8, wherein the medial joint surface of the tibial insert comprises a dwell point having an arched or oval shape when viewed in cross section.

(11) The shaping according to embodiment 1, wherein the medial joint surface of the tibial insert comprises a dwell point and an anterior medial lip, the anterior medial lip having a height of at least 9 millimeters relative to the dwell point. Surgical system.
(12) The orthopedic system according to embodiment 1, wherein the medial joint surface of the tibial insert comprises a dwell point having an arched or elliptical shape when viewed in cross section.
(13) The orthopedic system according to embodiment 1, wherein the first radius of curvature has a length of 41% to 47% of the anterior-posterior length of the tibial insert.
(14) The medial joint surface of the tibial insert comprises a dwell point, wherein the lateral joint surface provides an arched pathway for pivoting the femoral component around the dwell point. The orthopedic system described in.
(15) The orthopedic system according to the first embodiment, wherein the first radius of curvature extends forward to a degree of tortuosity of hyperextension of 30 degrees or less.

(16) A tibial insert of the knee arthroplasty system, wherein the tibial insert is:
With the lateral joint surface configured to articulate with the lateral condyle of the femoral component,
A medial joint surface configured to articulate with the medial condyle of the femoral component, wherein the medial joint surface is shaped asymmetrically with respect to the lateral joint surface, with a dwell point and the dwell point. A tibial insert, including a medial joint surface, including an anterior medial lip having a height of at least 9 mm relative to.
(17) The tibial insert according to embodiment 16, wherein the medial joint surface and the medial condyle of the femoral component are more compatible than the lateral joint surface and the lateral condyle of the femoral component.
(18) The tibial insert according to embodiment 16, wherein the dwell point has an arched or elliptical shape when viewed in cross section.
(19) The tibial insert according to embodiment 16, wherein the lateral joint surface comprises an anterior lateral lip having a height lower than said height of the anterior medial lip.
(20) An orthopedic system
Tibial inserts, including lateral and medial joint surfaces,
A femoral component comprising a medial condyle configured to form a joint on the medial joint surface of the tibial insert and a lateral condyle configured to form a joint on the lateral joint surface of the tibial insert. There is a first radius of curvature in which the medial condyle of the femoral component extends posteriorly to a first degree of flexion of 70 degrees or less, and from the first degree of flexion to the first degree of flexion. Includes a femoral component, including a femoral joint surface, with a plurality of diminishing radius of curvature that extends posteriorly to a large second degree of flexion.
The medial joint surface of the tibial insert is asymmetrically shaped with respect to the lateral joint surface and has an arcuate or oval shape when viewed in cross section with respect to the dwell point and the dwell point. An orthopedic system, including an anterior medial lip with a height of at least 9 mm.

(21) The orthopedic system according to embodiment 20, wherein the tibial insert comprises an anterior lateral lip, the height of the anterior medial lip being greater than the height of the anterior lateral lip.
(22) The femoral joint surface of the femoral component has a second radius of curvature at the second degree of flexion, and the second radius of curvature is the rearmost radius of the plurality of diminishing radii of curvature. 28. The orthopedic system according to embodiment 20.
(23) The orthopedic system according to embodiment 22, wherein the second radius of curvature is behind the decreasing radius of curvature.
(24) The medial joint surface of the tibial insert and the femoral joint surface of the medial condyle of the femoral component are the lateral joint surface of the tibial insert and the femoral joint surface of the lateral condyle of the femoral component. 20. The orthopedic system according to embodiment 20, which is more compatible than the above.
(25) The orthopedic system of embodiment 24, wherein the medial joint surface of the tibial insert and the femoral joint surface of the medial condyle have at least 93% medial-lateral compatibility.

(26) The orthopedic system of embodiment 20, wherein the lateral joint surface provides an arched pathway for pivoting the femoral component around the dwell point.
(27) The orthopedic system according to embodiment 20, wherein the first radius of curvature extends forward to a degree of tortuosity of hyperextension of 30 degrees or less.
(28) An orthopedic system
With a tibial insert, including the joint surface,
A femoral component comprising a condyle configured to form a joint on the articular surface of the tibial insert, the first curvature extending posteriorly to a first tortuosity of 70 degrees or less. A femoral component comprising a femoral joint surface having a radius and a plurality of decreasing radius of curvature extending posteriorly from said first degree of flexion to a second degree of flexion greater than said first degree of flexion. And, including
The articular surface of the tibial insert comprises a dwell point having an arched or oval shape when viewed in cross section, and an anterior lip having a height of at least 9 millimeters relative to the dwell point. Orthopedic system.
(29) The femoral joint surface of the femoral component has a second radius of curvature at the second degree of flexion, and the second radius of curvature is the rearmost radius of the plurality of diminishing radii of curvature. 28. The orthopedic system according to embodiment 28.
(30) The orthopedic system according to embodiment 29, wherein the second radius of curvature is behind the decreasing radius of curvature.

(31) The orthopedic system according to embodiment 30, wherein the joint surface of the tibial insert and the femoral joint surface of the condyle have at least 93% medial-lateral compatibility.

Claims (31)

An orthopedic system
A tibial insert having a medial and lateral joint surfaces, wherein the medial and lateral joint surfaces are formed asymmetrically with respect to each other.
A femoral component having a medial condyle configured to form a joint on the medial joint surface of the tibial insert and a lateral condyle configured to form a joint on the lateral joint surface of the tibial insert. There is a first radius of curvature in which the medial condyle of the femoral component extends posteriorly to a first degree of flexion of 70 degrees or less, and from the first degree of flexion to the first degree of flexion. A system for orthopedic surgery, including a femoral component, including a femoral joint surface, with a plurality of diminishing radius of curvature extending posteriorly to a large second degree of flexion. 1. The femoral joint surface of the femoral component has a second radius of curvature at the second tortuosity, the second radius of curvature being greater than each of the decreasing radius of curvature, claim 1. Orthopedic system described in. The shaping according to claim 1, wherein the femoral joint surface of the femoral component has a second radius of curvature behind the diminishing radius of curvature that is greater than the rearmost radius of the plurality of diminishing radii of curvature. Surgical system. The medial joint surface of the tibial insert and the femoral joint surface of the medial condyle of the femoral component are more compatible than the lateral joint surface of the tibial insert and the femoral joint surface of the lateral condyle of the femoral component. The orthopedic system according to claim 1, which has sex. The orthopedic system of claim 4, wherein the medial joint surface of the tibial insert and the femoral joint surface of the medial condyle have at least 96% anterior-posterior compatibility with zero degree flexion. The orthopedic system of claim 4, wherein the medial joint surface of the tibial insert and the femoral joint surface of the medial condyle have at least 93% medial-lateral compatibility. The orthopedic system of claim 6, wherein the lateral joint surface of the tibial insert and the femoral joint surface of the lateral condyle have at least 93% medial-lateral compatibility. The tibial insert comprises an anterior medial lip having a first height and an anterior lateral lip having a second height, wherein the first height of the anterior medial lip is that of the anterior lateral lip. The orthopedic system according to claim 1, which is larger than the second height. The orthopedic system of claim 8, wherein the medial joint surface of the tibial insert comprises a dwell point and the first height of the anterior medial lip relative to the dwell point is at least 9 millimeters. The orthopedic system of claim 8, wherein the medial joint surface of the tibial insert comprises a dwell point having an arched or oval shape when viewed in cross section. The orthopedic system of claim 1, wherein the medial joint surface of the tibial insert comprises a dwell point and an anterior medial lip, the anterior medial lip having a height of at least 9 millimeters relative to the dwell point. .. The orthopedic system of claim 1, wherein the medial joint surface of the tibial insert comprises a dwell point having an arched or oval shape when viewed in cross section. The orthopedic system of claim 1, wherein the first radius of curvature has a length of 41% to 47% of the anterior-posterior length of the tibial insert. 1. Orthopedic system. The orthopedic system according to claim 1, wherein the first radius of curvature extends forward to a degree of tortuosity of hyperextension of 30 degrees or less. The tibial insert of the knee replacement system, said tibial insert,
With the lateral joint surface configured to articulate with the lateral condyle of the femoral component,
A medial joint surface configured to articulate with the medial condyle of the femoral component, wherein the medial joint surface is shaped asymmetrically with respect to the lateral joint surface, with a dwell point and the dwell point. A tibial insert, including a medial joint surface, including an anterior medial lip having a height of at least 9 mm relative to. 16. The tibial insert according to claim 16, wherein the medial joint surface and the medial condyle of the femoral component are more compatible than the lateral joint surface and the lateral condyle of the femoral component. 16. The tibial insert of claim 16, wherein the dwell point has an arched or oval shape when viewed in cross section. 16. The tibial insert of claim 16, wherein the lateral joint surface comprises an anterior lateral lip having a height lower than said height of the anterior medial lip. An orthopedic system
Tibial inserts, including lateral and medial joint surfaces,
A femoral component comprising a medial condyle configured to form a joint on the medial joint surface of the tibial insert and a lateral condyle configured to form a joint on the lateral joint surface of the tibial insert. There is a first radius of curvature in which the medial condyle of the femoral component extends posteriorly to a first degree of flexion of 70 degrees or less, and from the first degree of flexion to the first degree of flexion. Includes a femoral component, including a femoral joint surface, with a plurality of diminishing radius of curvature that extends posteriorly to a large second degree of flexion.
The medial joint surface of the tibial insert is asymmetrically shaped with respect to the lateral joint surface and has an arcuate or oval shape when viewed in cross section with respect to the dwell point and the dwell point. An orthopedic system, including an anterior medial lip with a height of at least 9 mm. 20. The orthopedic system of claim 20, wherein the tibial insert comprises an anterior lateral lip, wherein the height of the anterior medial lip is greater than the height of the anterior lateral lip. The femoral joint surface of the femoral component has a second radius of curvature at the second degree of flexion, the second radius of curvature being greater than the rearmost radius of the plurality of diminishing radii of curvature. , The orthopedic system according to claim 20. 22. The orthopedic system of claim 22, wherein the second radius of curvature is behind the decreasing radius of curvature. The medial joint surface of the tibial insert and the femoral joint surface of the medial condyle of the femoral component are more compatible than the lateral joint surface of the tibial insert and the femoral joint surface of the lateral condyle of the femoral component. 20. The orthopedic system according to claim 20. 24. The orthopedic system of claim 24, wherein the medial joint surface of the tibial insert and the femoral joint surface of the medial condyle have at least 93% medial-lateral compatibility. 20. The orthopedic system of claim 20, wherein the lateral joint surface provides an arched pathway for pivoting the femoral component around the dwell point. The orthopedic system according to claim 20, wherein the first radius of curvature extends forward to a degree of tortuosity of hyperextension of 30 degrees or less. An orthopedic system
With a tibial insert, including the joint surface,
A femoral component comprising a condyle configured to form a joint on the articular surface of the tibial insert, the first curvature extending posteriorly to a first tortuosity of 70 degrees or less. A femoral component comprising a femoral joint surface having a radius and a plurality of decreasing radius of curvature extending posteriorly from said first degree of flexion to a second degree of flexion greater than said first degree of flexion. And, including
The articular surface of the tibial insert comprises a dwell point having an arched or oval shape when viewed in cross section, and an anterior lip having a height of at least 9 millimeters relative to the dwell point. Orthopedic system. The femoral joint surface of the femoral component has a second radius of curvature at the second degree of flexion, the second radius of curvature being greater than the rearmost radius of the plurality of diminishing radii of curvature. 28, the orthopedic system according to claim 28. 29. The orthopedic system of claim 29, wherein the second radius of curvature is behind the decreasing radius of curvature. 30. The orthopedic system of claim 30, wherein the joint surface of the tibial insert and the femoral joint surface of the condyle have at least 93% medial-lateral compatibility.

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